US7402035B2 - Apparatus for deep drawing a thermoplastic foil - Google Patents

Apparatus for deep drawing a thermoplastic foil Download PDF

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Publication number
US7402035B2
US7402035B2 US11/264,761 US26476105A US7402035B2 US 7402035 B2 US7402035 B2 US 7402035B2 US 26476105 A US26476105 A US 26476105A US 7402035 B2 US7402035 B2 US 7402035B2
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US
United States
Prior art keywords
plate
hold
foil
punch
punches
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related, expires
Application number
US11/264,761
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English (en)
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US20060099292A1 (en
Inventor
Jürgen Matzenmüller
Jörg Knüppel
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Uhlmann Pac Systeme GmbH and Co KG
Original Assignee
Uhlmann Pac Systeme GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Uhlmann Pac Systeme GmbH and Co KG filed Critical Uhlmann Pac Systeme GmbH and Co KG
Assigned to UHLMANN PAC-SYSTEME GMBH & CO. KG reassignment UHLMANN PAC-SYSTEME GMBH & CO. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KNUPPEL, JORG, MATZENMULLER, JURGEN
Publication of US20060099292A1 publication Critical patent/US20060099292A1/en
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Expired - Fee Related legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/30—Moulds
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B29C43/361—Moulds for making articles of definite length, i.e. discrete articles with pressing members independently movable of the parts for opening or closing the mould, e.g. movable pistons
    • B29C2043/3615—Forming elements, e.g. mandrels or rams or stampers or pistons or plungers or punching devices
    • B29C2043/3626—Forming elements, e.g. mandrels or rams or stampers or pistons or plungers or punching devices multi-part rams, plungers or mandrels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/42—Heating or cooling
    • B29C51/428—Heating or cooling of moulds or mould parts

Definitions

  • the present invention relates to a deep-drawing apparatus. More particularly this invention concerns such an apparatus used for making blister packs from a thermoplastic foil.
  • An apparatus for deep drawing a thermoplastic foil for the manufacture of blister packs as used in the packaging of pills or the like has an upper tool and a lower tool that are movable relative to each other and to a foil plane extending between them.
  • the lower tool can be moved by a first actuator, and the upper tool is provided with an extender on a rod that is mounted on another actuator.
  • the upper tool also has a separate seal piston that has its own actuator.
  • thermoshaper in WO 01/43947 of Hilpert has a complex arrangement of a spring-loaded hold-down plate and means for feeding air pressure through individual plungers to the foil to assist in the thermal deformation. This arrangement is complicated and requires substantial refitting when the arrangement of the blisters to be formed changes.
  • German 41 35 935 uses a lower tool having an array of cavities that can be evacuated to form blisters in the foil. Such an arrangement also requires a complex and expensive lower tool and makes it very difficult to change blister format.
  • thermoshaper It is therefore an object of the present invention to provide an improved thermoshaper.
  • thermoshaper that overcomes the above-given disadvantages, in particular that forms an array of accurately shaped blisters or pockets in a thermoplastic foil using tools that are relatively simple.
  • An apparatus for thermoshaping a thermoplastic foil has according to the invention a stationary frame, a lower tool carried on the frame and having an upper face formed with an array of upwardly open mold cavities, and an upper beam vertically displaceable on the frame above the lower tool.
  • a punch plate fixed on the upper beam is provided with an array of downwardly projecting punches fittable in the cavities.
  • a heater is connected to these punches.
  • a hold-down plate below the punch plate is limitedly vertically shiftable relative thereto. The hold-down plate is formed with an array of holes through which pass the punches, and this hold-down plate is actively cooled.
  • the holes according to the invention loosely receive the respective punches and the punches fit loosely in the respective cavities in the end position.
  • a seal ring between the hold-down plate and the punch plate extends around all of the punches and defines a pressurizable chamber when the punch plate is pressed by the actuator down against the hold-down plate.
  • Means is provided for pressurizing the chamber with a gas and thereby forcing the gas through the holes down against the foil and pressing the foil tightly into the cavities.
  • the punch plate and punches are formed of a heat-conducting material, e.g. aluminum.
  • the heater is connected directly to the punch plate so that the punches are heated conductively.
  • a cooler adjacent the frame is connected by a flexible hose to the hold-down plate.
  • the thermoshaping apparatus further has according to the invention a base plate fixed to the upper beam above the punch plate.
  • the punch plate is fixed via the base plate to the upper beam.
  • the base plate has a central mounting pin at which the punch plate is fixed and that defines an upright axis.
  • One of the punch and base plates is formed with a plurality of slots aligned radially with the axis and the other of the punch and base plates is formed with a plurality of axially extending guides fitting and slidable radially in the respective slots so that, on heating and radial expansion of the punch plate, the guides shift radially in the respective slots.
  • the slots are open outward at outer edges of the one of the base and punch plates, and the guides are cylindrical pins extending parallel to the axis. This allows the punch plate to expand thermally and, since its punches fit loosely in the hold-down plate holes and in the lower-tool cavities, such expansion is not a problem.
  • insulating spacers are provided between the base plate and the punch plate. This saves energy and prevents the base plate and upper beam from thermally expanding when the punch plate is heated.
  • spacers are provided for limiting penetration of the punches into the cavities.
  • Such spacers can be provided in the guides around the pins.
  • a lower beam on the frame carries the lower tool.
  • the actuator is connected to the lower beam for shifting the lower beam and lower tool synchronously and oppositely to the upper beam.
  • the lower tool moves upward, and vice versa.
  • the frame according to the invention includes vertical tie rods on which the beams can slide vertically.
  • FIG. 1 is a front view of an apparatus according to the invention at the start of a shaping cycle
  • FIG. 2 is a view like FIG. 1 with the upper and lower tools engaging the foil;
  • FIG. 3 is a view like FIG. 1 with the upper beam advanced into an end position to make blisters in the foil;
  • FIG. 4 is a perspective view of the upper tool
  • FIG. 5 is a perspective view of the insulated hold-down plate of the upper tool
  • FIG. 6 is a perspective view of the insulated punch plate of the upper tool
  • FIG. 7 is a vertical section through the upper tool of FIG. 4 in pushed-together condition
  • FIG. 8 is a top view of the punch plate with the guide pins of the base plate engaged in their guides;
  • FIG. 9 is a schematic representation of the connection formed by two hose loops between the hold-down plate and the base plate;
  • FIGS. 10 a and 10 b are side and bottom views of another type of connection of a coolant hose between the hold-down plate and the base plate;
  • FIG. 11 is a schematic representation of a static seal between the hold-down plate and the punch plate
  • FIG. 12 is a view like FIG. 11 showing a dynamic seal between the punch plate and the hold-down plate;
  • FIG. 13 is a partly broken-away perspective view of the base, punch, and hold-down plates.
  • FIG. 14 is a large-scale view of the detail indicated at XIV in FIG. 13 .
  • thermoshaping machine packages measured quantities of capsules, pills, tablets, or the like in a foil 1 , to which end blisters 2 are formed in the foil 1 , are filled with the product in a downstream filler, and then in a sealer further downstream in the foil-travel direction are sealed by a cover foil. Then a downstream stamper separates the filled and sealed blister packs from one another.
  • thermoshaping machine has a shaping apparatus 3 for forming the blisters 2 by deep drawing the thermoplastic foil 1 .
  • the apparatus has an upper tool 4 and a lower tool 5 that are movable vertically along a central axis A relative to each other and to a horizontal foil plane 6 between them.
  • the upper tool 4 includes a vertically displaceable upper transverse beam 7 and the lower tool 5 includes a lower transverse beam 8 .
  • the upper beam 7 and lower beam 8 can slide vertically on tie rods 9 connected to a stationary frame 27 and are shifted vertically by respective drives shown schematically at 28 and 29 .
  • the upper tool 4 carried on the beam 7 is comprised of a base plate 10 fixed on the upper beam 7 , a punch plate 11 fixed on the base plate 10 , and a hold-down plate 12 movable relative to the punch plate 10 and formed with an array of holes 14 through which engage punches 13 of the plate 11 .
  • the punch plate 11 is made of a heat-conducting material, preferably aluminum, and can be heated as shown schematically by the variable heater 15 in FIGS. 1 and 3 . Since the punch plate 11 is fixed by the base plate 10 to the upper beam 7 , it is not necessary to provide the apparatus 3 with a flexible cable to feed an electric resistance heater, instead a rigid cable and plug suffice.
  • FIGS. 6 Between the hold-down plate 12 and the punch plate 11 there are spacer plates 16 ( FIG. 6 ) that are thermally insulating in order to reduce heating of the base plate 10 .
  • the punch plate 11 is fixed at a central cylindrical pin 19 to the base plate 10 and thus is very accurately positioned in the machine frame 27 via the base plate 10 and the upper beam 7 .
  • Such mounting allows the punch plate 11 to thermally expand radially of the axis A out from the center pin 19 as shown in FIG. 8 , to which end cylindrical pins 18 engage in respective radially outwardly open guide slots 17 .
  • FIGS. 6 and 7 also show how the guide slots 17 are formed in the centers of outer edges in the punch plate 11 and the guide pins 18 are mounted on the base plate 10 at the outer edges thereof, the diameter of the pins 18 being essentially the same as the width of the slits 17 .
  • the hold-down plate 12 is mounted so that it can move vertically limitedly relative to punch plate 11 , normally returning by gravity to a lower position.
  • Coolant connections 26 ( FIG. 5 ) are mounted on the hold-down plate 12 and flexible coolant hoses 20 forming loops 21 are connected to the connections 26 in order to compensate for the relative movement of the hold-down plate 12 and the base plate 10 .
  • FIGS. 9 and 10 show two alternative hose arrangements, one ( FIG. 9 ) with bending of the coolant hose 20 and the other ( FIG. 10 ) with twisting.
  • the outer ends of the incoming and outgoing coolant hoses 20 are connected to a cooler 31 .
  • the lower tool 5 is formed as a cavity plate 22 with an array of upwardly open pockets or cavities 23 aligned with the punches 13 of the plate 11 .
  • FIG. 5 shows that the face of the hold-down plate 12 turned toward the punch plate 11 has an annular seal 24 surrounding the array of pockets 23 .
  • a pressure line 25 connected to a source 32 of air under pressure opens into the chamber 30 defined within the seal 24 between the punch plate 11 and the hold-down plate 12 so that in the FIG. 3 end position it is possible once the preshaping of the foil 1 has been done by the punches 13 to effect the final shaping by pressurization. To this end it is significant that the chamber 30 be of limited volume so it can be pressurized rapidly.
  • FIG. 5 shows a static seal set in an upper face of the punch plate 11 and bearing upward on the lower face of the hold-down plate as also illustrated in FIG. 11 . It is also possible to seal dynamically as shown in FIG. 12 with a wear-resistant seal 24 set in an outer edge of the punch plate 11 and bearing outward on an annular inner face of the hold-down plate 12 .
  • spacer disks 33 limit displacement of the punch plate 11 relative to the hold-down plate 12 .
  • the spacer disks 33 are provided in the guide slots 17 so as to limit the extent of insertion of the respective guide pins 18 in the respective guide slots 17 .
  • the spacer disks 33 are unitary with the base plate 10 and form annular rims of the base plate 10 projecting into the guide slots 17 and forming abutments for the guide pins 18 .
  • the foil 1 is moved in steps on the plane 6 .
  • the actuators 28 and 29 shift the lower tool 5 up so it engages the bottom face of the foil 1 , and the top tool 4 is moved downward.
  • the hold-down plate 12 engages the top face of the foil 1 and presses it down against the upper face of the lower tool 5 .
  • the supply 32 is actuated to pressurize the chamber 30 , and the pressurized air flows through the holes 14 , which are not completely blocked by the plungers 13 , so that the foil 1 is forced pneumatically downward in the cavities 23 to conform closely to their shapes, creating the blisters 2 .
  • This action also pushes the foil 1 down off the plungers 13 .
  • the actuators 28 and 29 then reverse to pull the lower tool 5 down away from the foil 1 , now formed with blisters 2 , and to pull the entire upper tool 4 up away from the foil 1 also. There is little likelihood of the foil 1 sticking to the tools 4 and 5 because it has already been separated from the hot punches 13 and is only engaged from above by a cooled part, the hold-down plate 12 .
  • the foil 1 can then be stepped downward and the cycle repeated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
US11/264,761 2004-11-10 2005-11-01 Apparatus for deep drawing a thermoplastic foil Expired - Fee Related US7402035B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102004054219A DE102004054219B4 (de) 2004-11-10 2004-11-10 Vorrichtung zum Tiefziehen thermoformbarer Folie
DE102004054219.8 2004-11-10

Publications (2)

Publication Number Publication Date
US20060099292A1 US20060099292A1 (en) 2006-05-11
US7402035B2 true US7402035B2 (en) 2008-07-22

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Family Applications (1)

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US11/264,761 Expired - Fee Related US7402035B2 (en) 2004-11-10 2005-11-01 Apparatus for deep drawing a thermoplastic foil

Country Status (5)

Country Link
US (1) US7402035B2 (de)
EP (1) EP1657047B1 (de)
JP (1) JP2006137191A (de)
AT (1) ATE417722T1 (de)
DE (2) DE102004054219B4 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9303666B2 (en) 2012-05-16 2016-04-05 Uhlmann Pac-Systeme Gmbh & Co. Kg Tool holder, tool, and work station with tool holder and tool attached thereto

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AU2003275672C1 (en) * 2002-11-25 2009-04-30 Godo Kaisha Ip Bridge 1 Moving Picture Coding Method and Moving Picture Decoding Method
DE102006004093B3 (de) * 2006-01-28 2007-03-29 Uhlmann Pac-Systeme Gmbh & Co Kg Arbeitsstation
DE102007041948A1 (de) * 2007-09-04 2009-03-05 Zahoransky Ag Vorrichtung und Verfahren zur Herstellung von Folienteilen
US8758669B2 (en) * 2008-06-30 2014-06-24 Ethicon, Inc. Method and device for forming pre-made pouches
NL2011625C2 (nl) * 2013-10-16 2015-04-20 Bosch Sprang Beheer B V Matrijssysteem voor een thermovormmachine, thermovormmachine en werkwijze voor het thermovormen van een product.
CN107225667B (zh) * 2017-07-08 2019-06-21 大埔县发源发展有限公司 一种陶瓷生产过程中的注浆装置

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3193881A (en) * 1961-09-06 1965-07-13 Comet Ind Automatic plastic forming and trimming machine
US4304178A (en) * 1979-04-28 1981-12-08 Lenser Kunststoff-Presswerk Gmbh & Co. Kg Spacer for interposition between a temperature-controlled plate and a pressure plate of a press
US4909722A (en) * 1987-06-23 1990-03-20 Shionogi & Co., Ltd. Apparatus for PTP pocket formation
US5182121A (en) * 1989-10-11 1993-01-26 Hitachi, Ltd. Hot press
DE4135935A1 (de) 1991-10-31 1993-05-06 Kloeckner Haensel Gmbh, 3000 Hannover, De Verfahren und vorrichtung zum taktweisen thermoverformen von kunststoffolie im endlosband
US5230910A (en) * 1989-09-26 1993-07-27 Henrich Eggert Apparatus for the cold deep drawing of films
US5262181A (en) 1990-05-14 1993-11-16 Erca Holding Apparatus for forming hollow articles in thermoplastic material
US5385465A (en) * 1990-12-28 1995-01-31 Greiwe; Daniel Verticle thermoforming apparatus
US5460497A (en) * 1991-12-16 1995-10-24 Devi S.P.A. Machine for moulding composite plastic material
US5901599A (en) 1995-07-18 1999-05-11 Toyota Jidosha Kabushiki Kaisha Method and apparatus for sheet forming a blank using a variable bead
US6234781B1 (en) * 1996-06-17 2001-05-22 Gillette Canada Inc. Apparatus for making blister pack packaging
WO2001043947A1 (de) 1999-12-17 2001-06-21 Rohrer Ag Verfahren und vorrichtung zur herstellung von verpackungen, ohne die folie zu heizen
US6314873B1 (en) * 1998-12-30 2001-11-13 Myron G. Lee Thermal presses for forming articles from a web of thermoplastic material and methods of operating thermal presses
EP1297943A1 (de) 2001-09-26 2003-04-02 Optipack GmbH & Co. KG Vorrichtung zum Tiefziehen von becherförmigen Körpern
WO2003092981A1 (de) 2002-05-02 2003-11-13 Bos Berlin Oberspree Sondermaschinenbau Gmbh Formvorrichtung zur herstellung eines komponententrägerbandes für elektronische bauteile

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3193881A (en) * 1961-09-06 1965-07-13 Comet Ind Automatic plastic forming and trimming machine
US4304178A (en) * 1979-04-28 1981-12-08 Lenser Kunststoff-Presswerk Gmbh & Co. Kg Spacer for interposition between a temperature-controlled plate and a pressure plate of a press
US4909722A (en) * 1987-06-23 1990-03-20 Shionogi & Co., Ltd. Apparatus for PTP pocket formation
US5230910A (en) * 1989-09-26 1993-07-27 Henrich Eggert Apparatus for the cold deep drawing of films
US5182121A (en) * 1989-10-11 1993-01-26 Hitachi, Ltd. Hot press
US5262181A (en) 1990-05-14 1993-11-16 Erca Holding Apparatus for forming hollow articles in thermoplastic material
US5385465A (en) * 1990-12-28 1995-01-31 Greiwe; Daniel Verticle thermoforming apparatus
DE4135935A1 (de) 1991-10-31 1993-05-06 Kloeckner Haensel Gmbh, 3000 Hannover, De Verfahren und vorrichtung zum taktweisen thermoverformen von kunststoffolie im endlosband
US5460497A (en) * 1991-12-16 1995-10-24 Devi S.P.A. Machine for moulding composite plastic material
US5901599A (en) 1995-07-18 1999-05-11 Toyota Jidosha Kabushiki Kaisha Method and apparatus for sheet forming a blank using a variable bead
US6234781B1 (en) * 1996-06-17 2001-05-22 Gillette Canada Inc. Apparatus for making blister pack packaging
US6314873B1 (en) * 1998-12-30 2001-11-13 Myron G. Lee Thermal presses for forming articles from a web of thermoplastic material and methods of operating thermal presses
WO2001043947A1 (de) 1999-12-17 2001-06-21 Rohrer Ag Verfahren und vorrichtung zur herstellung von verpackungen, ohne die folie zu heizen
EP1297943A1 (de) 2001-09-26 2003-04-02 Optipack GmbH & Co. KG Vorrichtung zum Tiefziehen von becherförmigen Körpern
WO2003092981A1 (de) 2002-05-02 2003-11-13 Bos Berlin Oberspree Sondermaschinenbau Gmbh Formvorrichtung zur herstellung eines komponententrägerbandes für elektronische bauteile

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9303666B2 (en) 2012-05-16 2016-04-05 Uhlmann Pac-Systeme Gmbh & Co. Kg Tool holder, tool, and work station with tool holder and tool attached thereto

Also Published As

Publication number Publication date
EP1657047A3 (de) 2008-02-27
ATE417722T1 (de) 2009-01-15
EP1657047B1 (de) 2008-12-17
DE102004054219A1 (de) 2006-05-11
DE502005006264D1 (de) 2009-01-29
JP2006137191A (ja) 2006-06-01
DE102004054219B4 (de) 2008-03-06
EP1657047A2 (de) 2006-05-17
US20060099292A1 (en) 2006-05-11

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